Perfluorinated chemicals (PFCs), including perfluorootanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) are organic compounds that have a fully or partially fluorinated carbon chain with a polar end group. These industrial compounds, with ubiquitous stable persistence in the environment, have been shown to cause adverse physiological effects. To date, various sorbents such as activated carbon, ion exchange resins, and clay have been reported for the removal of PFCs from water. We have shown a weak anion exchange (WAX) polymer derivatized with Kel-F 800, a co-polymer of chlorotrifluoroethylene and vinylidene fluoride, is effective for selective removal of PFOA from water. However, this material is too expensive to be scaled up for preparative (industrial scale) removal of PFCs from water. It is known that palygorskite-montmorillonite (Pal-Mt) clay particles are effective in the removal of organic amines such as the pharmaceuticals carbmezapine, diphenhydramine, and atenolol from water through likely interaction with the silanol groups present in the clay structure. In addition, thermal recycling of this clay by heating to 500 <sup>o</sup>C, has been shown to be feasible. Pressure stability of these clay particles when packed in 100 x 4.6 mm ID columns is good permitting breakthrough data of pumped analyte solutions. Recently, we have discovered that Pal-Mt clay, after derivatization with a polyamine such a polyethyleneimine (PEI), can be functionalized with Kel-F 800 to promote fluorophilic interactions. Variation of the PEI molar mass and consideration of other polyamines to generate this WAX-fluorocarbon polymer clay adsorbent is under study. Column breakthrough studies are also planned to generate Thomas and Yoon-Nelson kinetic data.<br/>

Particulate clay with a polyamine fluorocarbon polymer stationary phase as an adsorbent for the removal of perfluorinated chemicals from water

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.